target/linux/ipq806x/patches-4.19/0071-6-PCI-qcom-Force-GEN1-support.patch

   1 From 4910cfd150342ec7b038892262923c725a9c4001 Mon Sep 17 00:00:00 2001
   2 From: Sham Muthayyan <smuthayy@codeaurora.org>
   3 Date: Wed, 7 Sep 2016 16:44:28 +0530
   4 Subject: PCI: qcom: Force GEN1 support
   5
   6 Change-Id: Ica54ddb737d7b851469deab1745f54bf431bd3f0
   7 Signed-off-by: Sham Muthayyan <smuthayy@codeaurora.org>
   8 ---
   9
  10 --- a/drivers/pci/controller/dwc/pcie-qcom.c
  11 +++ b/drivers/pci/controller/dwc/pcie-qcom.c
  12 @@ -122,6 +122,8 @@
  13  #define PCIE20_v3_PARF_SLV_ADDR_SPACE_SIZE     0x358
  14  #define SLV_ADDR_SPACE_SZ                      0x10000000
  15
  16 +#define PCIE20_LNK_CONTROL2_LINK_STATUS2        0xA0
  17 +
  18  #define QCOM_PCIE_2_1_0_MAX_SUPPLY     3
  19  struct qcom_pcie_resources_2_1_0 {
  20         struct clk *iface_clk;
  21 @@ -212,6 +214,7 @@ struct qcom_pcie {
  22         struct phy *phy;
  23         struct gpio_desc *reset;
  24         const struct qcom_pcie_ops *ops;
  25 +       uint32_t force_gen1;
  26  };
  27
  28  #define to_qcom_pcie(x)                dev_get_drvdata((x)->dev)
  29 @@ -504,6 +507,11 @@ static int qcom_pcie_init_2_1_0(struct q
  30
  31         /* wait for clock acquisition */
  32         usleep_range(1000, 1500);
  33 +       if (pcie->force_gen1) {
  34 +               writel_relaxed((readl_relaxed(
  35 +                       pcie->pci->dbi_base + PCIE20_LNK_CONTROL2_LINK_STATUS2) | 1),
  36 +                       pcie->pci->dbi_base + PCIE20_LNK_CONTROL2_LINK_STATUS2);
  37 +       }
  38
  39
  40         /* Set the Max TLP size to 2K, instead of using default of 4K */
  41 @@ -1367,6 +1375,8 @@ static int qcom_pcie_probe(struct platfo
  42         struct dw_pcie *pci;
  43         struct qcom_pcie *pcie;
  44         int ret;
  45 +       uint32_t force_gen1 = 0;
  46 +       struct device_node *np = pdev->dev.of_node;
  47
  48         pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
  49         if (!pcie)
  50 @@ -1397,6 +1407,9 @@ static int qcom_pcie_probe(struct platfo
  51                 goto err_pm_runtime_put;
  52         }
  53
  54 +       of_property_read_u32(np, "force_gen1", &force_gen1);
  55 +       pcie->force_gen1 = force_gen1;
  56 +
  57         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "parf");
  58         pcie->parf = devm_ioremap_resource(dev, res);
  59         if (IS_ERR(pcie->parf)) {